How make a timelock contract?

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Actually i am learning new things. If i can get an example, it will be of great help.

MY CODE

pragma solidity ^0.5.0;

import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/v2.5.0/contracts/token/ERC20/ERC20.sol";
import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/v2.5.0/contracts/token/ERC20/ERC20Detailed.sol";
import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/v2.5.0/contracts/token/ERC20/ERC20Burnable.sol";

contract Token is ERC20, ERC20Detailed, ERC20Burnable {

    constructor () public ERC20Detailed("Token", "TKN", 18) {
        _mint(msg.sender, 1000000 * (10 ** uint256(decimals())));
    }
  
}

And tried to use this timelockcode

But where to set release time. i am using remix-solidity.

i used this timelock code

pragma solidity ^0.5.0;

import "@openzeppelin/contracts/token/ERC20/TokenTimelock.sol";

contract SimpleTokenTimelock is TokenTimelock {
    constructor(IERC20 token, address beneficiary, uint256 releaseTime)
        public
        TokenTimelock(token, beneficiary, releaseTime)
    {}
}

And manually transferred 1000 test tokens to this contract address

And my verified contract

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